JP3420077B2 - Electric leakage point detection method and device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth leakage point inspection apparatus for inspecting an earth leakage point of a line and a load connected to a low voltage distribution line, and more particularly to an earth leakage point inspection apparatus for identifying an electricity leakage point in an energized state.

[0002]

2. Description of the Related Art Conventionally, as this type of leakage location detecting device, Japanese Patent Laid-Open No. 3-4183 and Japanese Patent Publication No. 259898.
No. 4 is disclosed in FIGS. 7 and 8. This FIG. 7 shows a conventional device for detecting an earth leakage point (Japanese Patent Laid-Open No. 3-4
No. 183), and FIG. 8 is a block diagram of a conventional earth leakage location detecting device (No. 2599884).

In FIG. 7, the conventional leakage location detecting apparatus has a plurality of current detectors 200 for penetrating a low voltage distribution line to detect a leakage current and an output of the plurality of current detectors 200 for arithmetic processing and storage. A storage indicator 600 configured to display, the storage indicator 600 holds a plurality of outputs of the plurality of current detectors 200 and outputs the holding circuits 300. An arithmetic processing unit 400 configured to perform arithmetic processing to store and output the maximum leakage current value and the date and time of occurrence of the leakage current at predetermined time intervals.
And a display unit 500 that displays the data according to the display signal of the arithmetic processing unit 400.

Next, the operation of the conventional earth leakage location detecting device based on the above configuration will be described. Multiple current detectors 20
0 is attached to the wiring of a plurality of low-voltage distribution lines, and the current flowing through each wiring is detected by each current detector 200. The output of the detected current detected by each current detector 200 is sent to the holding circuit 300 provided corresponding to each current detector 200, and is held instantaneously. The detected current held in the holding circuit 300 is output to the arithmetic processing unit 400, and the arithmetic processing unit 400 arithmetically processes the maximum value of the leakage current at every predetermined time and stores the maximum value and the date and time of occurrence. , Is output to the display unit 500. This display unit 500 displays the maximum value of the leakage current and the date and time when it occurred.

Since the date and time of occurrence and the leakage current value can be stored and displayed for a plurality of circuits in this way, the cause of the leakage can be investigated even if intermittent leakage occurs. Further, since the output of the current detector 200 is held instantaneously, even if the earth leakage breaker cuts off at high speed, the earth leakage on the load side can be accurately detected and displayed.

Further, in the conventional leakage location detecting apparatus shown in FIG. 8, the load terminal device 101 is connected to the low-voltage distribution line 100 through the indoor / outdoor wiring, and is connected to the ungrounded phase distribution line 100a of the low-voltage distribution line 100. A ground fault current generator 210 that is detachably connected to the ground to allow a ground fault current to flow;
The load terminal device 1 is provided with a ground fault detector 220 that detects and displays the ground fault current flowing through the ground through the indoor / outdoor wiring connected to the load terminal device 101.
Ground-phase distribution line 10 of low-voltage distribution line 100 connected to 01
The configuration is to search for leakage current of 0b.

Based on this configuration, at the time of leakage detection, a ground fault current is caused to flow between the ungrounded phase distribution line 100a of the distribution line 100 and the ground, and the ground phase distribution line 100 is leaked through the ground.
The current imbalance caused by the ground fault current flowing into the wiring from the b side is detected to display the ground leakage on the ground phase distribution line 100b side. Further, when detecting a leak on the non-grounded phase distribution line 100a side, the ground fault current is not passed and the current is unbalanced due to the leak current and detected and displayed as before.

[0008]

Since the conventional device for detecting a leakage point is configured as described above, even in any case, the line in which the leakage has occurred can be specified (the range of the leakage can be specified). There is a problem in that it is not possible to sequentially narrow down the leakage points and specify them specifically. Particularly, in the conventional leakage location detecting apparatus shown in FIG. 7, the plurality of current detectors 200 are passed through each low voltage distribution line to detect the leakage current, so that the circuit configuration becomes complicated and the apparatus itself. Has the problem of increasing in size.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to surely and quickly identify the leakage point by narrowing the search range sequentially, and it is possible to accurately detect the leakage point with a simple and compact device configuration. An object is to provide a leakage location detecting device.

[0010]

[0011]

The earth leakage location exploring apparatus according to the present invention comprises an exploration signal injecting means for injecting an exploration signal into the power source side, and a detecting means for detecting the injected exploration signal in the load side to which power is supplied from the power source. comprising a, in leakage point locator to identify the leakage location, based on the search signal, the probe
The inspection signal injection means divides the core part into two parts,
With a clamp type transformer with the end surface of the core part as a flat surface
And then split the clamp type transformer
Stored in the case, the clamp type transformer is the case
If the detection means detects the exploration signal by a plurality of distribution lines at a predetermined value or more, or if the exploration signal is not detected by any of the plurality of distribution lines, The exploration signal injection means changes and injects the signal level of the exploration signal .

As described above, according to the present invention,
Clamp-type transformer with open core
The insertion means is formed, and this transformer can be rocked by an elastic member.
It should be supported in the case,
Detected on the load side based on the probe signal injected from the power supply side
Signal level of the probe signal according to the detected state of the probe signal.
Since the bell is changed and injected, it is divided.
Abutting the flat end face of the core part in an optimal state
Then, press the end face of this abutting flat surface with an elastic member
The continuous state is maintained, and in this state, it becomes the leakage resistance due to the leakage accident.
The sensitivity can be adjusted according to the magnitude of the leakage current that flows accordingly.
Therefore, the exploration signal injection means can be accurately and surely connected to the distribution line.
It can be installed, and the exploration range is gradually narrowed to identify the location of the leakage.
It can be identified in real time.

Further, in the device for detecting a leakage point according to the present invention, the exploration signal injection means is formed by a clamp type transformer covered with a magnetic shield cover as necessary, and the detection means is provided on the load side distribution line. The detection signal is detected in a non-contact manner. As described above, in the present invention, the exploration signal injection means is formed so that the magnetic shield cover is slidably moved to cover the clamp type transformer, and the detection means does not contact the detection signal with the distribution line on the load side. Therefore, it is possible to prevent the detecting means from detecting the exploration signal from the exploration signal injecting means by receiving the magnetic flux interference without passing through the distribution line. Only the exploration signal injected into the can be detected reliably.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment of the Invention) An earth leakage location inspection apparatus according to a first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an overall block configuration diagram of an earth leakage location detecting device according to the present embodiment, FIG. 2 is an operation flowchart of earth leakage location inspection of the earth leakage location detecting device described in FIG. 1, and FIG.
The operation explanatory drawing of the earth leakage location inspection apparatus described in FIG.

In each of the above-mentioned drawings, the apparatus for exploring leakage points according to the present embodiment includes exploration signal injection means 1 for injecting an exploration signal into the power supply side of the distribution line 100, and the injected exploration signal supplied from the power source. And a detection means 2 for detecting on the load side of the distribution line 100, the signal level of the search signal is lowered when the search signal detected by the detection means 2 is detected by a plurality of distribution lines 100 each having a predetermined value or more. When changing and injecting, or when the detection signal is not detected, the signal level of the exploration signal is changed and injected, and the leakage point is specified based on the detection signal detected by the exploration signal after this change. This is the configuration.

The exploration signal injection means 1 includes an exploration signal generator 11 for producing a high-frequency exploration signal, an exploration signal level adjuster 12 for adjusting the signal level of the exploration signal, and the exploration signal on the distribution line 100. The transmission unit 13 for injecting and the adjustment dial 15 for supporting the signal level of the search signal with respect to the search signal level adjustment unit 12 are provided. The transmitter 13 is formed in a clamp type in which a core portion divided into two parts is openably and closably supported, and the distribution line 100 is inserted into the core portion and mounted in a clamped state.
The configuration is such that a search signal is injected into this distribution line 100 and transmitted.

The detection means 2 is a receiving section 21 for receiving a probe signal in a contactless manner on the load side of the distribution line 100.
And a signal analysis unit 22 that analyzes the received search signal to identify a leak location, and a search result display / output unit 24 that outputs the analysis result of the signal analysis unit 22 and the identified leak location. It is a composition. The receiving unit 21 is composed of a coil-shaped winding, and the magnetic flux generated in the distribution line 100 through which the high-frequency search signal flows is linked to the winding to induce a voltage and a coil sensor for detecting the induced electromotive force. 21a
And a signal generation unit 22b for detecting based on the detected induced electromotive force.

The signal analysis unit 22 specifies the distribution line 100 in which the leakage is occurring based on the signal level of the search signal having the specific frequency detected by the reception unit 21, and
This is a configuration for executing the specification of the leakage point in the specified distribution line 100. The exploration result display / output unit 24
Is a configuration for displaying or notifying by sound or the like that there is a leakage point based on the analysis result of the signal analysis unit 22.

Next, the exploration operation of the leakage location exploration apparatus according to the present embodiment based on the above configuration will be described. First,
The transmitter 13 is mounted in a clamped state on the power supply side of the distribution line 100 in the live line state, which is the target line to be searched for the leakage point (step 1). The high frequency search signal generated by the search signal generation unit 11 is injected into the distribution line 100 via the mounted transmission unit 13 (step 2).

When there is a leakage point in the distribution line 100 while the search signal is being injected, the distribution line 100-leakage point-earth return route-B type ground line-distribution line 10
A closed circuit of 0 (see FIG. 3) is formed, and a high-frequency search signal is transmitted through this closed circuit. In such a state, the receiving unit 21 of the detecting means 2 is brought close to the distribution line 100, and a magnetic flux is generated around the distribution line 100 by this high frequency search signal, and this magnetic flux is the coil sensor 21 of the receiving unit 21.
An induced electromotive force is generated by interlinking with a to detect a search signal in a non-contact manner (step 3).

The operator determines whether or not the search signal detected in step 3 is based on the first search operation (detection operation) (step 4). 1 in this judgment
In the case of the second search, the receiving unit 21 of the detecting means 2 is sequentially moved from the direction A to the direction B as shown in FIG. 3 to change the detection position to another different distribution line 100 (step 5). The search signal is injected again with the detection position sequentially changed (step 2), and the search signal is further detected (step 3).

Whether or not this search signal is detected by the first search operation is judged by displaying or buzzer notification (step 4). If it is not the first exploration operation in step 4, it is determined whether or not exploration signals have been detected at plural locations by this exploration operation at multiple locations (step 6). When it is determined in step 6 that the search signal is not detected at a plurality of locations, it is determined whether or not the search signal is not detected at all (step 7).

When it is determined in step 7 that no search signal is detected, the operator recognizes and operates the adjustment dial 15, and the signal transmission unit 23 sends a search signal signal from the adjustment dial 15. The level is changed to be higher than the signal level of the probe signal currently being injected, and the control signal is output (step 8). In addition, the step 6
When it is determined that the exploration signal is detected at a plurality of positions in the above, the operator recognizes the display content and operates the adjustment dial 15, and the control signal transmission unit 23 outputs the signal level of the exploration signal from the adjustment dial 15. The control signal is output by changing the signal level to a level lower than the signal level of the search signal currently injected (step 9).

As described above, the steps 8 and 9 are performed.
The control signal for changing the signal level with the adjustment dial 1
After being sent from 5 to the search signal level adjusting unit 12, the search signal level adjusting unit 12 adjusts the signal level of the search signal generated and output from the search signal generating unit 11 based on this control signal (step 10). . The adjusted search signal is reinjected from the transmitter 13 into the distribution line 100 (step 2), and the steps 3 to 10 are repeated. As a result of the repeated operation, when it is determined in step 7 that the search signal is detected and displayed only at one location, the leakage location of the distribution line 100 is specified (step 11).

The location of the leakage in step 11 is specified in order from the power source side to the load side (the arrow direction from A to C, the arrow direction from C to D, the arrow direction from D to F in FIG. 3) from the power supply side. This is performed by moving the receiving unit 21 of the detecting means 2 and executing the detecting operation. In this detection operation, when the detection position of the receiving unit 21 of the detection unit 2 is moved from C to G, the detection signal cannot be detected by the detection unit 2, so that a leakage accident occurs in the branch wiring path including the detection position G. It can be determined that the problem has not occurred.
In this way, by moving the receiving unit 21 of the detecting means 2 to the load side from A to C, C to D, and D to F, it is specified that the device 101, which is the load terminal, has an electric leakage accident. be able to. Further, when the exploration signal is suddenly not detected from the distribution line 100 on which the leakage closed circuit is formed, that location is the leakage location.

(Second Embodiment of the Invention) FIG. 4 (A),
FIG. 3B is a detailed cross-sectional view of the transmitter of the leakage location search device according to the present embodiment. The transmitting unit 13 includes a main body 131 that also serves as a handle, clamp cases 132a and 132b that are supported by one end of the main body 131 by support pins 133a and 133b, and have communication holes, and the clamp cases 132a and 132b. Plate strip 1 in the storage hole of 132b
Core portion 13 swingably supported by 37 and 138
5, 136 and the clamp cases 132a, 132b
And a coil spring 134 for urging a pressing force so as to establish a joined state in which the respective storage holes are communicated with each other.

In the core portions 135 and 136, the U-shaped end surfaces 135a and 135b, 136a and 136b are flat surfaces, and the clamp cases 132a and 132b are formed.
Is formed with an outer dimension smaller than the shape of the storage hole of each of the end faces 135a, 135b, 1
36a, 136b in the direction of pushing forward the plate strip 13
It is configured to be pressed and supported by 7, 138. Further, the core portions 135 and 136 form a transformer together with windings (not shown), and when the core portions 135 and 136 are formed of a laminated body of electromagnetic steel sheet or ferrite, the U-shaped end faces are formed. Since the surfaces 135a, 135b, 136a, 136b are flat surfaces, the manufacturing process can be simplified.

Next, the exploration operation of the leakage location exploration apparatus according to the present embodiment based on the above configuration will be described. First,
The transmitter 13 of the exploration signal injection means 1 is attached to the distribution line 100 to be probed by holding the main body 131 of the transmitter 13 and the other end of the clamp case 132a against the elastic force of the coil spring 134. Press. This pressing operation causes the clamp case 132a to move to the other clamp case 13
2b, the electric wire 100 can be opened in the open state, and the distribution line 100 can be inserted between the clamp cases 132a and 132b in the open state in the arrow C direction in FIG. 4A.

When the pressing of the clamp case 132a to the other end side is released after inserting the distribution line 100, the elastic force of the coil spring 134 causes the clamp case 132a.
The a and 132b are engaged with each other so that the storage holes are in communication with each other. In the clamp cases 132a and 132b in the communicating state, the core portions 135 and 136 are in a swinging state and the end surfaces 13 are in a swinging state.
Since 5a, 135b, 136a, 136b are brought into contact with each other, the end faces 135a, 135b, 136a, 136b can be joined and integrated accurately and surely by the pressing force of the plate springs 137, 138.

Furthermore, since the distribution line 100 is in a live state, the end surfaces 135a and 135b of the core portions 135 and 136,
The magnetic fluxes penetrating 136a and 136b will connect them in an attracted state. However, since an AC voltage is applied to the distribution line 100, the zero point of the attraction force exists and vibrates. However, mutual action based on the elastic forces of the coil spring 134 and the plate springs 137 and 138 occurs. The vibration can be suppressed by the action. By accurately and surely joining and integrating the core portions 135 and 136 in this manner, the injection of the search signal can be performed without attenuation. Transmission unit 1 to this distribution line 100
After mounting 3, the detection of the leakage point can be executed in the same manner as the apparatus of the embodiment shown in FIGS. 1 to 3.

(Third Embodiment of the Invention) FIG. 5 (A),
(B) shows an operation explanatory view of attaching the magnetic shield cover to the transmission part of the leakage location search apparatus according to the third embodiment of the present invention. In the same figure, the leakage location inspection apparatus according to the present embodiment is provided with an inspection signal injection means 1 and a detection means 2 similarly to the apparatus of the embodiment described in FIG. 4, and the transmission section 13 of this inspection signal injection means 1 has two Divided core parts 135 and 136
Clamp cases 132a, 13 for supporting the openable and closable
2b. In addition to this structure, the outer circumference of the clamp cases 132a, 132b is covered with two magnetic shield covers 130a, 130b made of a magnetic material.

The magnetic shield covers 130a, 130
b is formed so as to slidably fit two housings whose side surface portions are in an open state, and the insertion portion 130 is formed by notching the center of the upper and lower surfaces adjacent to the open side surfaces of the housings in a substantially arc shape.
This is a configuration in which c and 130d are formed.

Next, the search operation of the present embodiment based on the above configuration will be described. When the transmitter 13 is attached to the distribution line 100 as in the apparatus of the embodiment shown in FIG.
In the state shown in (A)), the magnetic shield covers 130a and 130b are attached from both sides of the transmitter 13 so as to be fitted in the direction of the arrow in the figure. This installed state is shown in FIG.
It shows in (B). In the figure, the magnetic shield cover 130
a and 130b cover the entire transmission unit 13, and the insertion unit 130c is provided along the cross-sectional external dimensions of the installed distribution line 100.
130d is fitted, and the hole for inserting the distribution line 100 can be mounted in a state where the hole is made as small as possible.

In this manner, the electromagnetic shield covers 130a and 130b are slidably adapted according to the wire size of the distribution line 100, and the distribution line 100 is inserted into the minimum insertion hole so that the search signal is injected. The exploration signal from the means 1 is not injected into parts other than the distribution line 100,
Since the magnetic flux does not leak and is not directly detected by the detecting means 2 in the adjacent distribution line 100, the leakage location can be reliably searched.

(Other Embodiments of the Present Invention) FIG. 6 is a block diagram showing the overall structure of an earth leakage location detecting apparatus according to an embodiment of the present invention. In the figure, the leakage location detecting apparatus according to the present embodiment is provided with an exploration signal injection means 1 and a detection means 2 as in the apparatus of the embodiment described in FIG. 1, and in addition to this configuration, Is provided with a control signal receiver 14 in place of the adjustment dial 15 and additionally with a control signal transmitter 23 in the detection means 2.

The control signal transmitting section 23 includes a signal analyzing section 2
When it is determined that a plurality of search signals are detected based on the analysis result of No. 2, the search signal injection unit 1 to the distribution line 10
A control signal for changing the signal level of the search signal injected to 0 to be low, and a control signal for changing the signal level of the search signal to be high when it is determined that the search signal is not detected Is. The control signal receiving unit 14 receives the control signal transmitted from the control signal transmitting unit 23, and inputs the control signal to the search signal level adjusting unit 12 as an adjustment command.

Next, the operation operation of the present embodiment based on the above configuration will be described. First, as in each of the above-described embodiments, a high-frequency search signal is input from the search signal injection means 1 to the distribution line 100, the search signal flows to the load side through the earth return path, and is detected on the load side of the distribution line 100. Means 2
Is detected by the receiving unit 21. The signal analysis unit 22 analyzes the detected search signal, and the control signal transmission unit 23 outputs the control signal to the control signal reception unit 14 based on the analysis result.

The output control signal is used as the signal analysis unit 2
When the analysis result of 2 is that no exploration signal has been detected at all, it is an instruction to increase the signal level of the exploration signal, and on the other hand, it is assumed that multiple exploration signals have been detected. In this case, the command is to lower the signal level of the search signal.

As described above, the signal level of the exploration signal is adjusted based on the analysis result of the detection means 2 to identify the distribution line 100 in which the leakage is occurring, and further received from the power supply side of the distribution line 100 to the load detection side. By conducting the search so as to move the portion 21, it is possible to specify a specific location in the distribution line 100 as a leakage location.

The detecting means 2 in each of the above embodiments
Is configured to move the power supply side of the distribution line 100 to the load side to execute the exploration operation. The signal level of the exploration signal is adjusted and injected with the movement from the power supply side to the load side. You can also Further, even if the load is a one-sided load circuit in each of the connection embodiments, it is possible to search for a leakage point as long as the distribution line is in a leakage state. Further, the clamp type transformer in the transmitting unit 13 of the exploration signal injecting means 1 may have an annular shape in addition to the rectangular frame shape.

[0042]

As described above, in the present invention, the division
Clamp-type transformer with a core
No. injection means is formed, and this transformer can be rocked freely by an elastic part.
This exploration signal injection device should be supported by the material inside the case.
On the load side based on the exploration signal injected from the stage to the power side
Depending on the detection status of the detected probe signal, the signal of the probe signal is sent.
Since the injection is performed by changing the signal level,
Optimum flat end face in the split core part
Abutting and pressing the end face of the abutting flat surface with an elastic member
To maintain the connection state, and in this state,
The sensitivity can be adjusted depending on the magnitude of the leakage current flowing according to the resistance.
This means that the exploration signal injection means can be accurately and accurately connected to the distribution line.
It can be actually installed, and the exploration range is gradually narrowed to the point of leakage.
The effect is that the can be identified reliably and quickly . Well
Further, in the present invention, the exploration signal injection means is formed by slidably moving the magnetic shield cover to cover the clamp type transformer, and the detection means does not contact the exploration signal with the distribution line on the load side. Since the detection is performed, there is an effect that only the true search signal can be reliably detected at an arbitrary position of the distribution line without detecting the interference of the magnetic flux due to the search signal from the search signal injection means.

[Brief description of drawings]

FIG. 1 is an overall block configuration diagram of a ground fault location inspecting apparatus according to a first embodiment of the present invention.

FIG. 2 is an operation flowchart of a leakage location search of the leakage location search device shown in FIG.

FIG. 3 is an operation explanatory diagram of the ground fault location detection device described in FIG. 1.

FIG. 4 is a detailed cross-sectional view of a transmission unit of an earth leakage location search device according to a second embodiment of the present invention.

FIG. 5 is an operation explanatory diagram of attaching a magnetic shield cover to a transmission unit of an earth leakage location search device according to a third embodiment of the present invention.

FIG. 6 is an overall block configuration diagram of an earth leakage location search device according to another embodiment of the present invention.

FIG. 7 is a conventional device for detecting a leakage point (Japanese Patent Laid-Open No. 3-4183).
No.) block diagram.

FIG. 8 is a conventional device for detecting an earth leakage point (No. 2598984).
No.) block diagram.

[Explanation of symbols]

1 Exploration signal injection means 2 Detection means 11 Exploration signal generator 12 Search signal level adjuster 13 Transmitter 14 Control signal receiver 21 Receiver 21a Coil sensor 22 Signal analysis unit 22b signal generator 23 Control signal transmitter 24 Exploration result display / output section 100 distribution line 100a Ungrounded phase distribution line 100b Ground phase distribution line 101 load terminal equipment 130a, 130b Magnetic shield cover 130c, 130d insertion part 131 main body 132a, 132b Clamp case 133a, 133b Support pin 134 coil spring 135, 136 Core part 135a ・ 135b, 136a ・ 136b Each end face 137, 138 plate spring 200 current detector 210 Ground fault current generator 220 ground fault detector 300 holding circuit 400 arithmetic processing unit 500 display 600 memory display

Continuation of front page (56) Reference JP-A-3-15772 (JP, A) JP-A-3-81671 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01R 31 / 02-31/11

Claims (2)

(57) [Claims] 1.Search signal injection to inject search signal to the power supply side
The input means and the injected exploration signal from the power source.
Is provided with a detection means for detecting on the load side,
Leakage point detection device that identifies the leakage point based on the exploration signal
In the The exploration signal injection means divides the core portion into two
Clamp type tiger whose end surface of the core part is flat
And the clamp-type transformer is divided.
The clamp type transformer is stored in the enclosed case.
It is formed by being supported by an elastic member so that it can swing within the case. The detection means detects the exploration signal on a plurality of distribution lines over a predetermined value.
Or detect the exploration signal on any of multiple distribution lines.
If the search signal injection means is
To inject at varying levels Characteristic leakage point
Exploration device. 2.The leakage location detecting device according to claim 1.
At The exploration signal injection means is covered with a magnetic shield cover
Clamp-type transformer
It is possible to detect the detection signal without contacting the distribution line on the load side.
Characteristic device for detecting leakage points.